Smallpox vaccination is not usually needed now, and the smallpox virus has basically become extinct in China. Smallpox virus in history has had an outbreak of pandemic, but also mutated a variety of strains of subtypes, resulting in the death of thousands of patients, but later scientists discovered the vaccination of cowpox can prevent smallpox, initially curbed the spread of smallpox virus, with the vaccine technology is becoming more and more mature, smallpox virus is basically extinct in China. Nowadays, smallpox vaccine is generally not needed because there are no more infected people in China, which means that there is no source of infection, and only samples are kept in virus laboratories for research purposes. There is no risk of infection in the general population, so even if you do not get the smallpox vaccine, it does not matter.